So London is launching its ultra low emissions zone in April, which initially only covers the very small congestion charge area, but will expand to a much larger area in 2021 getting close to my house. I was happy (and a bit surprised) to find that my wife's Mini PHEV qualifies as a low emissions vehicle. Given that we live 12 miles from London and by the time we get there the battery would have pretty much exhausted itself, then this seems rather generous. Then I thought let's check Prius, the self-charging wonder, as there are so many Uber drivers using these that there would be uproar if they did not qualify for exemption. Lo and behold, after punching in a reg plate from a car on autotrader, they are also exempt. Seems "Slightly lower emissions zone" might be a better description than "ultra low"